Detachable ratcheting shaft for specimen retrieval bag

ABSTRACT

A system for retrieving a specimen includes a collapsible bag having a first mating member and a retrieval device having a second mating member. The second mating member cooperates with the first mating member for coupling the collapsible bag with the retrieval device. A rotation mechanism is disposed in the retrieval device. Actuation of the rotation device collapses an excess portion of the collapsible bag.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims the benefit of and priority to U.S.Provisional Application Ser. No. 61/550,549, filed on Oct. 24, 2011, theentire contents of which are incorporated herein by reference.

BACKGROUND

1. Technical Field

The present disclosure relates to a surgical system for use in minimallyinvasive procedures. More particularly, the present disclosure relatesto a system for a retrieval of a specimen from a minimally invasivesurgical site.

2. Background of the Related Art

Laparoscopic and endoscopic surgical procedures are minimally invasiveprocedures in which operations are carried out within the body by meansof elongated instruments inserted through small entrance or accessopenings in the body, e.g., an opening defined by a natural passagewayof the body, an opening created by a tissue piercing instrument (e.g., atrocar), etc.

Minimally invasive procedures are often used to partially or totallyremove body tissue or organs from the interior of the body, e.g.,nephrectomy, cholecystectomy and other such procedures. During suchprocedures, it is common that affected tissue or organ must be removedvia the access opening in the skin, or through a cannula. Various typesof entrapment devices are known in the art to facilitate this procedure.

Many entrapment devices are configured to decrease a volume of a tissueor otherwise reshape a tissue to facilitate a removal of the tissue. Forexample, a specimen retrieval bag including a morcellation meansconfigured to percutaneously debulk tissue may be utilized. In anotherexample, a specimen retrieval device includes a drawstring to decreasethe volume of a specimen retrieval bag and a tissue therein. Entrapmentdevices are ideally of minimal volume and/or cross-section to facilitatea passage thereof through an opening and a maneuvering thereof in aninternal cavity. There is a continuing need for improved specimenretrieval devices of decreased volume and improved maneuverability.There further remains a need for improved methods of removing a specimenfrom a bodily opening.

SUMMARY

In one aspect, a system for retrieving a tissue specimen is providedwhich includes a specimen retrieval bag having a first mating member anda retrieval device having a housing having a second mating member. Thesecond mating member cooperates with the first mating member forcoupling the bag with the retrieval device. A rotation mechanism isdisposed in the retrieval device. Actuation of the rotation device drawsan excess portion of the bag into the retrieval device.

The system may retract the excess portion of the bag into the housing ofthe retrieval device. The rotation mechanism may include a knob foractuating the rotation mechanism. The retrieval device may include aratchet mechanism to inhibit rotation of the rotation mechanism in atleast one direction. The first mating member may be a lip and the secondmating member may be a slit. The retrieval device can include an innermember around which the bag is wound. In some embodiments, the firstmating member is slid into engagement with the second mating member. Insome embodiments, the rotation mechanism includes a slot having a firstwidth and the housing includes a slot having a second width greater thanthe first width.

In another aspect, a method for retrieving a tissue specimen from a bodycavity is provided which includes the steps of inserting a retrieval baginto the body cavity, placing a specimen into the bag, inserting aretrieval device into the body cavity, engaging the bag with theretrieval device, rotating an excess portion of the bag about an axis ofthe retrieval device to draw the excess portion of the bag into theretrieval device, and removing the retrieval device and the bag from thebody cavity.

The step of engaging the bag may include engaging a lip of the bag witha slit of the retrieval device. The retrieval device in the method mayinclude a knob and an axle for rotating the excess portion of the bag.The retrieval device may include a ratchet mechanism to inhibit rotationof the rotation mechanism in at least one direction. The rotating stepmay store the excess portion of the bag.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of the present disclosure are described hereinbelowwith references to the drawings, wherein:

FIG. 1 is a side, perspective view of a specimen retrieval systemaccording to the principles of the present disclosure;

FIG. 2 is a side, perspective view of a retrieval device of the specimenretrieval system of FIG. 1;

FIG. 3 is a bottom, perspective view of a distal end of the retrievaldevice of FIG. 2;

FIG. 4A is a side, perspective view of a ratchet mechanism of theretrieval device of FIG. 2;

FIG. 4B is a side, cross-section view of the ratchet mechanism of FIG.2C; and

FIGS. 5A-5D are side perspective views of the specimen retrieval systemof FIG. 1 removing a tissue from a body cavity through an opening.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present disclosure will now be described in detailwith reference to the drawings, in which like reference numeralsdesignate identical or corresponding elements in each of the severalviews. As used herein, the term “distal” refers to the portion of theinstrument which is farthest from the user, while the term “proximal”refers to that portion of the instrument which is closest to the user.In the following description, well-known functions or constructions arenot described in detail to avoid obscuring the present disclosure inunnecessary detail.

As used herein with reference to the present disclosure, the termsminimally invasive refer to instruments having a relatively narrowoperating portion for insertion into a cannula, a small incision in theskin or through a body opening. Minimally invasive surgical proceduresinclude for example laparoscopic, endoscopic, video assisted thoracicprocedures, etc. It is believed that the present disclosure may find usein any procedure where access to the interior of the body is limited toa relatively small incision, with or without the use of a cannula, as inminimally invasive procedures.

With reference to FIG. 1, a specimen retrieval system 10 according to anembodiment of the present disclosure is illustrated. Specimen retrievalsystem 10 includes a retrieval device 100 and a collapsible specimenretrieval bag 200 configured for mating together. Specimen retrievalsystem 10 may be composed of any suitable biocompatible materials, suchas biocompatible plastics.

Retrieval device 100 includes a knob 110, an axle 120, a housing 130,and a housing slit 140. Bag 200 includes a lip 240, a connection 230,and a body 250. Connection 230 interconnects lip 240 and body 250.Connection 230 is substantially flat. In one embodiment, lip 240 issubstantially cylindrical. However, lip 240 may alternatively have anyshape capable of mating with retrieval device 100.

Body 250 is sufficiently flexible to be rolled, folded, or otherwisecompressed by retrieval device 100. Body 250 has an open end 210 and aclosed end 220. Open end 210 is a proximal end of body 250, and closedend 220 is a distal end of body 250. Body 250 has a volume greater thana specimen “S” for receiving specimen “S” therein. Open end 210 allows apassage of material therethrough and has a perimeter sufficient for thepassage of specimen “S” therethrough.

Referring to FIG. 2, retrieval device 100 has a longitudinal axis “A”defined through axle 120. Knob 110 is located at a proximal end ofretrieval mechanism 100 and is fixedly attached to axle 120, such that arotation of knob 110 rotates axle 120. Axle 120 extends from knob 110through housing 130. Housing 130 is a cylindrical, hollow structureconfigured for housing a ratchet mechanism 150, an axle segment 122 ofaxle 120, and a portion of bag 200. Housing 130 has a proximal enddistal to knob 110. Ratchet mechanism 150 is located at the proximal endof housing 130 and provides for incremental rotation of axle 120. Axlesegment 122 is located within housing 130 distal to ratchet mechanism150. Axle segment 122 is hollow and configured for a receipt of lip 240.Housing slit 140 is an elongated opening in retrieval device 100extending from a position distal to ratchet mechanism 150 to a distalend of housing 130.

As seen in FIG. 3, axle segment 122 has a path 144 therein for receivinglip 240. Axle segment 122 has an axle slit 142 that may be aligned withhousing slit 140 upon a rotation of axle 120. Axle slit 142 has a widthless than a width of lip 240 to frictionally hold lip 240 within path144. Housing slit 140 has a width “W₁” at least as wide as the width oflip 240 to allow lip 240 to enter path 144. A gap 146 exists betweenaxle segment 122 and housing 130. Gap 146 is sufficiently large to allowa substantial portion of bag 200 to wrap around axle segment 122.

Referring to FIGS. 4A-4B, ratchet mechanism 150 includes a gear 152,pawls 154, teeth 156, and a spring 158. At least one pawl 154 and atleast one tooth 156 are provided, though various embodiments may havegreater numbers of teeth and pawls. Gear 152 is concentric with axle120, and gear 152 has a wider radius than a radius of axle 120. Teeth156 extend distally from gear 152. Pawls 154 are fixedly attached to theinside of housing 130 in a position distal to gear 152 and in slidablecontact with teeth 156. Spring 158 is positioned within housing 130between a proximal end of gear 152 and a proximal end of housing 130.Spring 158 exerts a force that pushes gear 152 distally.

Each tooth 156 has an acute side 156 a extending at an acute angle fromgear 152 and a perpendicular side 156 b extending perpendicularly fromgear 152. Other configurations of teeth 156 that assist movement of gear152 in a single direction are also contemplated, including arcuate teethand teeth with sides extending from obtuse angles from gear 152.Alternatively, it may be desirable for teeth 156 to have two acute sides156 a if bidirectional movement of gear 152 is needed,

A rotation of knob 110 in a first direction rotates axle 120 in thefirst direction and further rotates gear 152 in the first direction. Therotation of gear 152 in the first direction places at least one side 156a into contact with at least one pawl 154. Contact of a side 156 a witha pawl 154 during rotation of gear 152 in the first direction causes atooth 156 to slide proximally along the pawl 154 and translate gear 152proximally along axis “A”. When the tooth 156 is fully proximal to thepawl 154, the rotation of gear 152 in the first direction rotates thetooth 156 in the first direction until the tooth 156 is no longer incontact with the pawl 154, allowing the force of spring 158 to push gear152 distally until the tooth 156 is no longer fully proximal to the pawl154. Side 156 h is configured such that rotational contact thereof witha pawl 154 does not cause the side 156 b to slide proximally along thepawl 154, thus inhibiting gear 152 from rotating in a second direction.

Turning to FIGS. 5A-5D, an exemplary method of use of specimen retrievalsystem 10 is illustrated. Any commonly known surgical tool, such assurgical forceps, may be suitable for manipulating specimen retrievalsystem 10 according to this method. As seen in FIG. 5A, a tissuespecimen “S” lies in a cavity “C” underlying a tissue “T”. An opening“O” exists in tissue “T” and is sufficiently wide for allowing a passageof specimen retrieval system 10 therethrough. An access port (not shown)can be inserted through the opening “O” through which system 10 isinserted. First, a cross-sectional area of bag 200 is decreased forinsertion through opening “O” for example, through a rolling or foldingof body 250. As seen in FIG. 5B, bag 200 may be expanded within cavity“C” by a surgical instrument such as a grasper (not shown) to allow aninsertion of specimen “S” therein. Specimen “S” is inserted through openend 210 and placed in bag 250. The bag 250 is thus inserted into thebody cavity “C” without the housing 130, and can remain in body cavity“C” without the housing 130 during the surgical procedure, until removalis desired. The absence of such elongated housing during the surgeryfacilitates access and maneuverability within the cavity “C”.

As seen in FIG. 5C, when it is desired to remove the bag, retrievaldevice 100 is inserted through opening “O” and mated with bag 200. Lip240 is inserted through path 144 and connection 230 is inserted throughhousing slit 140 and axle slit 142. Knob 110 may then be rotated toretract an excess portion of bag 250 into gap 160 within housing 130,which decreases a volume and/or cross-section of bag 250 and maycompress specimen “S”. Such reduction in bag size and specimencompression facilitates removal. Ratchet mechanism 150 inhibits theexcess portion of bag 250 from returning outside housing 130, As seen inFIG. 5D, retrieval device 100 compresses bag 250 until specimenretrieval device 10 has a sufficiently small cross section to passthrough opening “O”. At this point, specimen retrieval device 10 may belifted proximally through opening “O” to complete a removal thereof.

As can be appreciated, being able to adjust the size of the bag whilestill in the body cavity, after the specimen is inserted, allows the useof a larger size bag. It also allows a single sized bag to be used for awide range of specimen sizes as the bag size can be adjusted in situ,rather than relying on different size bags for different size specimens,

Although the illustrative embodiments of the present disclosure havebeen described herein with reference to the accompanying drawings, theabove description, disclosure, and figures should not be construed aslimiting, but merely as exemplifications of particular embodiments. Itis to be understood, therefore, that the disclosure is not limited tothose precise embodiments, and that various other changes andmodifications may be effected therein by one skilled in the art withoutdeparting from the scope or spirit of the disclosure.

What is claimed is:
 1. A system for retrieving a specimen comprising: acollapsible bag having a first mating member; a retrieval device havinga housing having a second mating member, the second mating membercooperating with the first mating member for coupling the bag with theretrieval device when the bag is inside a patient's body; and a rotationmechanism disposed in the retrieval device, wherein actuation of therotation device draws an excess portion of the collapsible bag into theretrieval device.
 2. A system according to claim 1, wherein the excessportion is retracted into a housing of the retrieval device.
 3. A systemaccording to claim 1, wherein the rotation mechanism comprises a knobfor actuating the rotation mechanism.
 4. A system according to claim 1,wherein the retrieval device includes a ratchet mechanism to inhibitrotation of the rotation mechanism in at least one direction,
 5. Asystem according to claim 1, wherein the first mating member is a lipand the second mating member is a slit.
 6. A system according to claim1, wherein the rotation mechanism includes a knob and an axle.
 7. Amethod according to claim 1, wherein the retrieval device includes aninner member around which the bag is wound.
 8. A system according toclaim 1, wherein the first mating member is slid into engagement withthe second mating member.
 9. A system according to claim 1, wherein therotation mechanism includes a slot having a first width and the housingincludes a slot having a second width greater than the first width. 10.A method for retrieving a tissue specimen from a body cavity, comprisingthe steps of: inserting a specimen retrieval bag into the body cavity;placing a specimen into the retrieval bag; inserting a retrieval deviceinto the body cavity; engaging the retrieval bag with the retrievaldevice; rotating an excess portion of the retrieval bag about an axis ofthe retrieval device to draw the excess portion the retrieval bag intothe retrieval device; and removing the retrieval device and theretrieval bag from the body cavity.
 11. A method according to claim 10,wherein the step of engaging the retrieval bag includes engaging a lipof the bag with a slot of the retrieval device.
 12. A method accordingto claim 10, wherein the retrieval device includes a knob and an axlefor rotating the excess portion of the retrieval bag.
 13. A methodaccording to claim 10, wherein the retrieval device includes a ratchetmechanism to inhibit rotation of the rotation mechanism in at least onedirection.
 14. A method according to claim 10, wherein the step ofrotating an excess portion stores the excess portion in the housing.